If you have a
.tex file with the tables in the bottom and you need to get then moved, then I don't think there is a better way than then copy-paste method.
If the motivation for putting the tables in the bottom whilst editing is to make the
.pdf file easier to navigate by not having huge tables in the middle of it all, then a solution could be to place
in your preamble and then write your tables as
Here the awesome table will appear!
Then the table will be included if you include
\showtablestrue in your preamble and the text will be included instead if you include
\showtablesfalse in your preamble. You can also just remove the text and the
\else, then it is only a matter of whether the table appears or not.
In my opinion this is not that complicated to remember, so if you are working with co-authors, then you might be able to convince them to use the same method.
This of course also works with other things than tables.